Abstract

In this paper, a soft switching DC-DC converter control strategy based on fixed boundary layer sliding mode control (FBLSMC) and switching frequency modulation is presented with application to an electric vehicle (EV) powered by a hybrid energy storage system (HESS). This strategy is aimed at improvement of transient performance, energy transfer efficiency and system robustness for the HESS By fully taking into account all PWM operating modes and the occurrence of system uncertainties, the state-space model of the studied DC-DC converter is newly established. The chattering-free FBLSMC scheme for current/voltage tracking is proposed to guarantee the systematic robustness. Meanwhile, in order to ensure soft switching operating effectiveness and accordingly high efficiency, an adaptive switching frequency modulation method is presented complying with the state equations and proposed principles. Finally, experimental results considering the transient response and driving cycle operation confirm the validity and application feasibility of the proposed strategy in the HESS powered electric vehicle.

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